#include <int.h>

void systen_int()
{
	P0 = 0xff;
	P2 = P2 & 0X1F |0X80;
	P2 &=0X1F;

	P0 = 0X00;
	P2 = P2 & 0X1F |0XA0;
	P2 &=0X1F;
}